Centrifugal pulp-screen.



A. J. HAUG.

GENTRIFUGAL PULP SCREEN.

101: FILED JUNE 29, 1910. RENEWED NOV.22,1913.

APPLIOAT Patented Aug. 11, 1914;.

2 BHBETB-SHEET 1.

20252916 5&9.- SQ- A. J. HAUG.

GENTBIFUGAL PULP SCREEN.

APPLIOATIDN FILED 11199, 1910' BEHEWED NOV. 22, 1013. 1,106,808-

Patented Aug. 11, 19M.

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TED STATEd PATENT @FFMIEd ANTON J. HAUG, or NASHUA, new HAMPSHIRE, 'nssrerivort TO THE rivrrnovnn earns MACHINERY COMPANY, OF

CENTRIFUG-AL PULP-SCREEN.

Specification of Letters Patent.

Application filed June 29, 1910, Serial No. 569,458.

Patented Aug. lil, 119141. Renewed November 22, 1913. Serial No. 802,365.

To all whom it man concern:

Be itknown that I, ANTONJ. HAUG, a subject of the Emperor of Germany, and a resident of Nashua, in the county of Hillsboro, State of New Hampshire, United States of America, have invented certain new and useful Improvements in Centrifugal Pulp-Screens, of which the following is tion.

end plates a a Figure 1 is a side view in central vertical section of a machine embodying my invention. Fig. 2 is an end view in central vertical section. Fig. 3 is a detailed perspective view of part of a screen drum.

Referring to the drawings a denotes the machine casing, which comprises a horizontally arranged cylindrical shell a and b is a shaft supported in bearings b b at each end of the casing and extending through said casing. 8 denotes the screen drum, which is cylindrical in form and is supported at each end from the inner walls ofthe end plates. The screen illustrated in the drawings and described herein is of the stationary type, though it is not essential to the operation of the device that it should be. e

Arranged centrally of the length of the casing is an inlet 1' which passes through the shell and screen drum and then branches toward each end of the machine in feed .spouts.10-10, which are of course located within the screen drum and spaced therefrom. -These spouts have holes near their -outer. ends through which the stock is delivered to the interior of the screen drum. Mounted on the shaft within and near each end of the casing are hubs 1515, carrying disks 16-46, from the outer. edges of which project blades 17-17, which extend '10 10. The shaft is intended to rotate at a high rate of speed, and these blades catch ings at the ends of the feed spouts, and throw it against the screen drum with such force as to cause the fine pulp to pass through the screen against the inner wall of the casing, whence it drops to the bottom of the machine and passes out through the pulp outlet 0. The blades are oppo-' sitely inclined towardthe center of the machine, as illustrated, in order to give the pulp a tendency to move toward the center of the machine, with the result that the slivers and coarser particles which cannot end of the machine toward the center where they are delivered to the sliver outlet 0. To make sure of; clearing the interior of the machine from slivers which collect at the center, I prefer either to project a cirscreening drum. as illustrated in Fig. 3 which will cause the slivers when they strike this ring on either side to drop and pass out of the sliver outlet, or I can cut away the center of the screen and interpose a trough 22 which will receive the slivers and carry them down to the sliver outlet at the lower part of the machine, as illustrated at O in Fig. 1. v

through the outer ends, of the feed spouts it will be thrown against the outer ends of the screen drum, and then moved toward the center of the machine. ation is a continuous one, and there will althe center "of the machine. v

The screening operation is practically an instantaneous one, that is to say-the screening is all done at the moment when the pulp is thrown against the screen by the blades. Such pulp asis not screened at this operation is carried along with the slivers and lostin the waste. In order to bring. the machine up to the highest point of efiiciency, and to prevent such waste of stock, I introduce a shower pipe 30 inside of the blades, preferably near the lower part of the ma- It will be seen that as the stock is fed only ways be a steady current of slivers toward the pulp as it is delivered through the openpass through the screen travel from each cumferential ring 20 just inside of the i The screening oper- I very materially increased without materially increasing the amount of water in the stock.

The machinemade in accordance with my invention is simple in its construction, has a large capacity, screening operation and easily handled and controlled. The inclination of the blades may be variedfor stock of different densities, that is small amount-ofwater in it is to be screened,

the inclination-of the blades can be reduced,

'ving' such stbck as is not screened at the rst' -imp'iictf .a'.longer time to travel across the face in th' screen, during which it is 'subject'edftothe action of the spray from the shower" ipe, y while with a thinner stock which will screen more readily, the inclinaiffidesireithe feed s up to deliverthe' stoc tion of -the blades may be increased. Also, outs can be shortened near thecenter of the machine, and the blades can be inclined in v directions opposite to thoseillustrated in the 85 drawings, orcing the slivers toward the ends" of the machine,

outlets. This is merely a variation of which a machine made in accordance with my invention is susceptible. i"

I claim as my invention:

1. In a machine of the character described, the combination with acasing and a cylin drical screen drum located therein, of an inlet extending through said casing and said screen drum intermediate the length thereof, said inlet having lateral extensions within the screen drum and spaced therefrom, outlets near the ends of said lateral extensions, separate outlets from the casing for the slivers and the screened ulp, and means located between said lateral extensions and the screen drum for delivering the stock to the screen drum for causing the slivers to movev toward the sliver outlet.

2. In a machine of the character described a horizontal cylindrical casing, a shaft extending therethrough, a cylindrical screen drum located within said casing, a set of paddles supported from said shaft at each end of the machine and extending toward the center thereof, said paddles being adapted to rotate with their outer edges in close proximity to said screen drum, the paddles toward is extremely: eflicient in its tosay' if a heavy-stock with a' I where they can be col- .le'cted zand' removed through two separate of one set being inclined o positely to those of the other set and inclined rearwardly withrespect to their direction of rotation toward the center of the machine, an inlet arranged intermediate the length of the machine and extending into the interior of the screen drum, and feed spouts extending from each side of said inlet withinthe plane of said paddles and having delivery openings near the opposite respective ends of the screen, a shower pipe located within said screen drum and arranged inside of said addles; a sliver outlet in communication with the screen drum at its central part and a pulp outlet in communication with the interior of the casing.

3. In a machine of the character described a horizontal c lindrical casing, a shaft extending theret rough, a casing drum located within said 'c'asin :and supported at its end from the end wal s of said casing, collecting means arranged circumferentially of said screen drum near itscenter, asliver outlet in'communication with the interior of said screen in the planeof said collecting means,

an inlet arranged intermediate the length of the machine and extending into the interior of said screen drum, feedspouts extending from each side of said inlet toward the ends ofythe imachine and spaced from said screentdrumj paddle blades located in and adaptedto rotate through the annular spaces formed 'be'tween the screen drum and said'feed spouts,is aid blades being suptportcd from their enter ends by said sha the blades atfon'e end being inclined oppositely to those at flthe other end, said inclination being to ar'd'the center of the machine and rearwardly" with respect to the direction of rotation of said blades, a shower pipe located within said screen drum and inslde'of said blades and extending lengthwise said screen drum, and a pulp outlet in communicatiouwithgthe interior of said casing.

4. In a machine of thecharacter described the combination. with a casing and a cylindrical screen drum located therein, of an inlet extendii'ig through said casing and said screen drum intermediate the length thereof, said inlet having lateral extensions within the screen drum and spaced therefrom, outlets near the ends of'said lateral extensions, a pulp outlet from? the casing, a sliver outlet communicating with the interior of the screenintermediate the: ends thereof, and means .locatedbetween said lateral extensions and said screen 'drum for delivering stock to said screenand for causing slivers to move toward'the center of said screen to the sliver outlet;

5. ln'amach' e of the character described,

the combination with a casing ofuaicylin drical screen drum located thereindfa stock inlet extending through'said'ca'si'ng and said said stock outlets toward the sliver outlet.'

6. In a machine of the character described a horizontal cylindrical casing, a shaft extending therethrough, a cylindrical screen drum located with said casing, a set of paddles supported from said shaft at each end of the machine and extending toward the center thereof, said paddles being adapted to rotate with their outer edges in close proximity to said screen drum, the paddles of one set being inclined oppositely to those of the other set and inclined rearwardly with respect to their direction of rotation toward the center of the machine, an inlet arranged intermediate the length of the machine and extending into the interior of the screen drum, and feed spouts extending from each side of said inlet within the plane of said paddles and having delivery openings near the opposite respective ends of the screen, a sliver outlet in communication with the screen drum at its central part and a pulp outlet in communication with the interior bf the casing.

7. In a machine of the character described a horizontal cylindrical casing, a shaft extending therethrough, a screen drum located within said casing and supported at its end from the end walls of said casing, collectin means arranged circumferentially of sai screen drum near its center, aisliver outlet in communication with the interior of said screen in the plane of said collecting means, an inlet arranged intermediate the length of the machine and extending into the interior of said screen drum, feed spouts extending from each side of said inlet toward the ends of the machine and spaced from said screen drum, paddle blades located in and adapted to rotate through the annular spaces formed between the screen drum and said feed spouts, said blades being supported from their outer ends by said shaft, the blades at one end being inclined oppositely to those at the other end, said inclination being toward the center of the machine and rearwardly with respect to the direction of rotation of said blades, and a pulp outlet in communication with the interior of said casing.

8. In a machine of the character described, a horizontal cylindrical casing, a shaft extending therethrough, a screen drum located can within said casing and supported at its end from the end walls of said casing, collecting means arranged circumferentially of said screen drum near its center, a-sliver outlet in communication with the interior of said screen and with said collecting means, stock feeding means extending into the interior of said screen and having discharge openings near opposite ends of the screen, paddle blades located in and adapted to rotate through a space formed between the screen drum and the stock feeding means, said blades being supported by said shaft, the blades at oneend being inclined oppositely to those at the other end, said inclination being toward the center of the machine and rearwardly with respect to the direction of rotation of said blades, and a pulp outlet in communication with the interior of said casing.

9. In a machine of the character described, the combination with a casing; of a cylindrical screen drum located therein, a stock inlet having a lateral extension with a discharge orifice near one end of the screen drum and adapted to deliver the stock thereat, a .pulp

.outlet in communication with the interior of the casing, a sliver outlet communicating with the interior of the screen and located approximately in alinement with said stock inlet, and means interposed between said drum and said lateral extention for delivering the stock against said drum and causing the slivers to travel lengthwise the drum toward the sliver outlet, said means comprise ing a series of rotatable paddle blades in clined rearwardly with respect to the direction of rotation from the stock delivery out-- let to the sliver outlet.

10. In a machine of the character described a horizontal casing, a shaft extending therethrough, a screen drum located within said casing, a sliver outlet in communication with the interior of the screen and intermediate the ends thereof, stock delivering means extending into the interior ofvsaid screen and having discharge openings for dischar ing stock at the respective opposite ends 0 the screen, paddle blades located in and adapted to rotate through spaces between the screen and said discharge openings, said blades being supported by said shaft and the blades at one end being inclined oppositely to those at the other end, said inclination being toward the center of the machine and rearwardly with the direction of rotation, and a pulp outlet in communication with the interior of the casing.

' 11. In a machine of the character described, the combination with a casing of a cylindrical screen drum located therein, a stock inlet extending through the casing and the screen drum intermediate the length thereof, said inlet having discharge openings within the screen drum, sliver discharge spect to the direction of rotation from the means communicating with the interior of stock delivery discharge openings to the the drum, a pulp outlet communicating with sliver dischargemeans.

the interior of the casing, and a series of ANTON J. HAUG. 5 paddle blades Within the drum and between Witnesses:

the stock inlet means and the casing, said H. P; GBEELEY,

blades being inclined rearwardly with re- HOWARD PARKER. 

